System and method of product authentication

ABSTRACT

A method and system are provided. The method involves generating a plurality of nanoparticles, isolating fluorescent nanoparticles, embedding the fluorescent nanoparticles in a resin and applying the resin on a product. The system is for product authentication and includes a light source, fluorescence nanoparticles, a detector and a resin for applying on a product. Furthermore, a non-transitory computer readable medium encoded with codes is provided to direct the system to carry out the method.

FIELD

The present specification relates generally to product authentication,and specifically to product authentication using markings.

BACKGROUND

Production and distribution of counterfeit products represents anemerging global crisis, which results in a substantial amount of lostrevenue for all parties involved. This problem affects nearly everycommercial sector and can have consequences for unsuspecting consumers.Legitimate brand and intellectual property owners also suffer due tobrand erosion and financial losses. Over the last decade, counterfeitershave become more sophisticated and have expanded counterfeitingactivities to include high value products, such as anti-cancer drugs.Large international crime syndicates have also started to establishcounterfeiting divisions within their own organizations due to the highprofit potential and comparatively lesser penalties compared to otherillegal activities such as trafficking narcotics. Ultraviolet responsiveinks and holography have been used to provide a means to verifyauthenticity of products; however, counterfeiters constantly developways to overcome these mechanisms.

The actual revenue lost by legitimate corporations is difficult toestimate. Similar issues exist in the anti-counterfeiting sector insofaras it is nearly impossible to determine the return on investment from ananti-counterfeiting technology. Conventional solutions focus either oncustomer engagement or security. Most commercially available securityfeatures require laboratory analysis or the use of proprietary scanningequipment for detection, which are only accessible to brandinvestigators and law enforcement officials.

SUMMARY

In accordance with an aspect of the specification, there is provided amethod of product authentication. The method involves generating aplurality of nanoparticles in a reaction chamber. In addition, themethod involves isolating fluorescent nanoparticles from the pluralityof nanoparticles. The fluorescent nanoparticles have a peak fluorescencewavelength associated with a peak emission wavelength of a light source.Furthermore, the method involves embedding the fluorescent nanoparticlesin a resin. The method also involves applying the resin on a product.

The method may further involve illuminating the resin on the productusing the light source. The method may also involve measuring afluorescent response to the light source.

The method may further involve performing colorimetric analysis on thefluorescent response.

The light source may be a light emitting diode.

The light source may include a plurality of light emitting diodes.

Each light emitting diode of the plurality of light emitting diodes mayemit light having a different peak emission wavelength.

The method may further involve adding pigment to the resin to form anink.

The resin may be clear to form a clear coat on the product.

Applying the resin may involve applying the resin in a pattern.

The pattern may be a machine readable code.

Applying the resin may involve applying the resin proximate to aninherent reference point on the product.

In accordance with an aspect of the specification, there is provided asystem for product authentication. The system includes a light sourcehaving a peak emission wavelength. In addition, the system includesfluorescent nanoparticles having a peak fluorescence wavelengthassociated with the peak emission wavelength. Furthermore, the systemincludes a detector for detecting a fluorescent response to the lightsource by the fluorescent nanoparticles. The system also includes aresin into which the fluorescent nanoparticles are embedded, the resinfor applying on a product.

The system may further include a processor configured to performcolorimetric analysis on the fluorescent response.

The light source may be a light emitting diode.

The light source may include a plurality of light emitting diodes.

Each light emitting diode of the plurality of light emitting diodes mayemit light having a different peak emission wavelength.

The system may further include an ink formed from the resin and thefluorescent nanoparticles.

The resin may be clear to form a clear coat on the product.

The resin may be applied on the product in a pattern.

The pattern may be a machine readable code.

In accordance with an aspect of the specification, there is provided anon-transitory computer readable medium encoded with codes. The codesare for directing a processor to activate a light source having a peakemission wavelength. In addition, the codes are for directing theprocessor to receive image data from a detector configure to detect afluorescence response to the light source by fluorescent nanoparticles.The fluorescence response has a peak fluorescence wavelength associatedwith the peak emission wavelength. Furthermore, the codes are fordirecting the processor to apply a saturation mask to the image data.The codes are also for directing the processor to perform colorimetricanalysis to determine the peak fluorescence wavelength in thefluorescence response.

The light source may be a light emitting diode.

BRIEF DESCRIPTION OF THE DRAWINGS

Reference will now be made, by way of example only, to the accompanyingdrawings in which:

FIG. 1 is (a) a schematic representation of the front of a device inaccordance with an embodiment; and (b) a schematic representation of theback of the device;

FIG. 2 is (a) a schematic representation of the device of FIG. 1 inoperation; and (b) another schematic representation of the device ofFIG. 1 in operation;

FIG. 3 is (a) a schematic representation of the front of a system inaccordance with an embodiment; and (b) a schematic representation of theback of the system;

FIG. 4 is (a) a schematic representation of the system of FIG. 3 inoperation; and (b) another schematic representation of the system ofFIG. 3 in operation;

FIG. 5 is a schematic representation of a device in accordance withanother embodiment;

FIG. 6 is a flow chart of a method of authentication in accordance withan embodiment;

FIG. 7 is a flow chart of a method of authentication in accordance withanother embodiment; and

FIG. 8 is a flow chart of a method of manufacturing a mark in accordancewith an embodiment.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Described herein are methods, systems and devices for productauthentication and customer engagement. In some examples of the methods,systems and devices, a mark, such as a security mark, is applied to aproduct or a product package. The mark includes an optically responsivematerial formulation, which can be detected by the device to determineauthenticity of the product. The optical response generated by the markultimately depends on the device being used for authentication. Thedevice can be any type of computing device capable of eliciting andmeasuring the optical response, such as a fluorescent response. It is tobe appreciated that, in general, the device includes programminginstructions in the form of codes stored on a computer readable mediumfor performing the functions, such as in the form of a downloadableapplication. For example, the device can be any one of a personalcomputer, a laptop computer, a portable electronic device, a gamingdevice, a mobile computing device, a portable computing device, a tabletcomputing device, a personal digital assistant, a cell phone, a smartphone or the like. In an embodiment, the device is a mobile computingdevice, such as a smartphone, having a single light source, such as alight emitting diode or a plurality of light emitting diodes in closeproximity.

The materials that are contained within the mark are generallyconfigured to be excited by light at around a peak absorption wavelengthand emit light around a peak emission wavelength. The peak emissionwavelength and/or the pattern of the mark can be collected and analyzedto determine authenticity of a product. It is to be appreciated by aperson of skill in the art with the benefit of this description that theauthentication process is not particularly limited. For example, thepeak emission wavelength of the mark can be extracted from the image andconverted into a hex code or red-green-blue (RGB) code. Subsequently,the extracted code can be cross referenced with a database that containsa library of codes pertaining to authentic products. Furthermore, themark can be applied in a variety of different patterns. Each pattern cancorrespond to a particular color code that in turn corresponds to aspecific peak emission wavelength of the material. As an example, thepattern of the mark can be used to obtain the corresponding color codefrom a secure online database. If that color code matches the peakemission wavelength of the material, the product can be deemed to beauthentic.

In another embodiment, the mark may also be exposed to multiple lightsources, each having a different peak emission wavelength (i.e. color).It is to be appreciated by a person of skill in the art that the lightsources are not particularly limited. In some embodiments, the lightsources can be in the form of a plurality of individual light sources ora single broadband light source combined with a monochromator. Whenexposed to the different wavelengths of light, the mark can emit lightnear one or more peak fluorescence wavelengths depending on thewavelength of the light source. It is to be appreciated that in someembodiments, multiple peak fluorescence wavelengths can be provided suchthat they form a unique fluorescence spectrum associated with theplurality of light sources. The dependence of the peak fluorescencewavelengths on the wavelength of the light source provides a securemethod that results in a feature that is very difficult to duplicate,since most fluorescent and phosphorescent materials are excitationindependent. Accordingly, it is to be appreciated by a person of skillin the art with the benefit of this description that the fluorescencespectrum can be customized for each product, such that every product hasa unique identifier.

A user interface (UI) associated with the device and/or the opticalscanner is also provided. The user interface can be used to guide usersthrough the authentication process, display product information, andcommunicate promotional offers or exclusive marketing content as part ofa customer engagement platform. The device and/or the optical scannercan also be loaded with software. The software can direct the device toextract unique identifiers from an image or a fluorescence spectrum,which can then be used to determine authenticity. Furthermore, it is tobe appreciated that the device and/or the optical scanner may have theability to connect remotely to a wireless network and access a secureonline database containing a library of different identifiers thatpertain to legitimate products.

The mark is not particularly limited and can be in the form of amachine-readable code, such as a barcode, in order to transmitinformation about a specific product in some embodiments. Accordingly,different types of devices can be used to verify the authenticity of themark as long as each device can read the machine-readable code. Thiswould enable the selective dissemination of product information.Therefore, brand/IP owners can control access to certain productinformation. Since the fluorescence spectrum can represent a securefeature and requires sophisticated detection equipment, it can also beused to communicate confidential or sensitive information about theproduct, and update product information as part of a track and traceprogram. It is to be appreciated that the manner by which theconfidential and sensitive information is communicated is notparticularly limited. For example, the mark itself may contain theinformation in a format readable by the detection equipment.Alternatively, the mark can be used as a key to obtain access to theconfidential information from a secure database. Furthermore, a devicehaving a single light source, such as a typical smartphone may only beable to observe product information whereas a sophisticated opticalscanner with multiple proprietary light sources may be authorized tochange said information. The systems presented herein can also requirethe user to log in or register an account, which can be another methodof controlling access to product information via secure databases.

Referring to FIGS. 1a and 1b a device 50 is generally shown. In thepresent embodiment, the device 50 is a portable electronic device, suchas a smartphone. The device 50 includes a display 55, a camera 60 and alight source 65. The light source 65 is not particularly limited. In thepresent embodiment, the light source 65 is a light emitting diode havinga peak emission wavelength. However, in other embodiments, the lightsource 65 can be another source such as a laser or arc lamp orincandescent light. It is to be appreciated by a person of skill in theart that the device 50 further includes a computer readable medium (notshown) that can be used to store programming instructions and otherdata. The programming instructions are generally configured to direct aprocessor of the device 50 to perform various functions such running anoperating system to control the display 55, the camera 60, and the lightsource 65. In particular, the display 55 can be a touch screen displayfor providing a user interface for the authentication process.

FIGS. 2a and 2b show the device 50 in use to authenticate a product 100.The product 100 is not particularly limited and can be any product orcontainer to be authenticated. In the present embodiment, the product100 is a package. The product 10 includes a mark 105 that is not clearlyvisible to the human eye. For example, the mark 105 can be formed by theapplication of ink on the product. In this embodiment, the ink can beclear and provide a mark or pattern on the product 100 not visible tothe naked eye under normal ambient conditions. The location of the mark105 is indicated by a target 110 on the product 100 and is present forthe identification of the location of the mark 105. In otherembodiments, the target 110 may not be present. In the presentembodiment, the camera 60 of the device 50 is used to capture an imageof the target 110. In order to capture the image of the target mark, thelight source 65 is activated when the image is captured. The lightsource 65 exposes the product 100 to a burst of light 115 to reveal themark 105 to the camera 60.

In the present embodiment, the mark 105 includes at least onefluorescent material. In some embodiments, the light source 65 is usedto elicit a fluorescent response from the mark 105. In the presentembodiment, the light source 65 includes a yellow peak and a blue peakthat appear to be a white light emitting diode flash to the naked humaneye. The light source 65 excites the fluorescent material containedwithin the mark 105. In an example, the fluorescent material can have anabsorption spectrum that overlaps with the emission spectrum of thelight source 65. In other embodiments, the fluorescent material can emitseveral different wavelengths of light when excited. The combination ofwavelengths emitted from the mark 105 generates a single color. Infurther embodiments, the fluorescent material can possess an emissionspectrum that overlaps with the visible spectrum, such that the coloremitted from the mark 105 can be detected using the camera 60. Theemission color and the pattern of the mark 105 recorded by the camera 60can be collectively analyzed to determine authenticity.

In the event that the product 100 is determined to be authentic, thedevice 50 can provide an indication that the product 100 is authentic.The manner by which the indication is provided is not particularlylimited. For example, in the present embodiment, the mark 105 comprisesa symbol. However, it is to be appreciated by a person of skill in theart that variations of the mark 105 are contemplated, such as a machinereadable code, a logo, or a signature. The use of machine readable codesenables the device 50 to extract information about the product 100. Thedevice 50 can also be used to update information about the product 100as part of a track and trace platform. The extent to which the device 50is provided access to product information and the ability of the device50 to update said information may be determined by the identity of theuser of the device 50. The manner by which an identity is determined isnot particularly limited. For example, identification can be done usingbiometric analysis (i.e. fingerprint, retinal scan, voice recognitionetc.) or through the input of a password.

Referring to FIGS. 3a and 3b , a system 200 in use to authenticateproducts in accordance with another embodiment is generally shown. Thesystem 200 includes a device 50 a, such as a smartphone, attached to alight source 205. It is to be appreciated by a person of skill in theart with the benefit of this description that the device 50 a can besimilar or identical to the device 50 described above; however, thedevice 50 a is not particularly limited. For example, the device 50 acan be any one of a personal computer, a laptop computer, a portableelectronic device, a gaming device, a mobile computing device, aportable computing device, a tablet computing device, a personal digitalassistant, a cell phone or the like. Although the light source 205 isshown as a separate component attached to the device 50 a, it is to beunderstood that a variety of different forms are contemplated. In thepresent embodiment, the device 50 a includes camera 60 a and an optionallight source 65 a. In the present embodiment, the light source 205 is incommunication with the device 50 a and includes a series of lightemitting diodes 210 located on the rear of the light source 205 as shownin FIG. 3b . In the present embodiment, each of the light emittingdiodes 210 emits light having varying peak emission wavelengths (i.e. adifferent color of light). The light emitting diodes 210 on the lightsource 205 are connected to the device 50 a to provide power using theinternal power source of the device 50. In this example, the lightsource 205 is connected to the device 50 via a USB cable. In otherembodiments, the light source 205 can be connected to the device 50 ausing a lightning port, or wirelessly using Bluetooth communicationchannels, or any other suitable port. Accordingly, it is to beappreciated by a person of skill in the art with the benefit of thisdescription that the light emitting diodes 210 on the light source 205can also be powered using an external power source, such as a batterypack.

FIGS. 4a and 4b show the system 200 in use to authenticate the product100. In the present embodiment, the camera 60 a of the device 50 a isused to capture an image of the target 110. In order to capture theimage of the mark 105, the light source 205 is activated to illuminatethe target 110. The light source 205 exposes the target 110 to a burstof light 215. The device 50 a and light source 205 are used toauthenticate the product 100. In the present embodiment, the camera 60 ais used to capture an image of the mark 105 when exposed to differentsources of light. In the present embodiment, the light source 65 a onthe device 50 a and the series of light emitting diodes 210 located onthe light source 205 can be activated in sequence as bursts of light 215being emitted from the rear of the light source 205. The camera 60 a canthen capture images of the mark 105 under different conditions, such asdifferent light sources with different emission spectra. In addition, itis to be appreciated that the camera 60 a can also capture an imageusing the ambient light without a burst of light 215 to provideadditional information.

As shown in FIG. 3b , there are five light emitting diodes 210 and awhite light source 65 a in the present embodiment. By activating thelight emitting diodes 210 and the light source 65 a one after the other,the camera 60 a will capture six images of the mark 105. It is to beappreciated that the sequence by which the light emitting diodes 210 andthe light source 65 a are activated is not particularly limited and thatany sequence can be used as a substitute. Upon the activation of a lightemitting diode or other light source, the mark 105 or a portion of themark 105 can be revealed and may become visible to the human eye and/ordetectable by the camera 60 a. It is to be appreciated by a person ofskill in the art with the benefit of this description that the mark 105is not particularly limited. In the present example, the mark 105comprises a symbol. In other embodiments, different shapes, orientation,and/or structures for the mark 105 can be substituted, such as a machinereadable code, a logo, or a signature. The mark 105 comprises a materialformulation that fluoresces when exposed to a light source. The materialformulation provides a fluorescent response that may change depending onthe excitation source. The fluorescent responses elicited by differentexcitation sources may be used to generate a unique product identifier.Those with skill in the art and the benefit of this description willrecognize the advantages associated with an excitation dependentfluorescent response and the ability to create unique productidentifiers. Furthermore, it is to be appreciated that the mark 105 caninclude more than one material formulation and provide differentresponses for each of the light emitting diodes 210 and the light source65 a. Therefore, the material formulations can be used as anotherverification to provide a multi-factor authentication.

For example, exposing the mark 105 to the light source 65 a can providea first image based on a material formulation having a peak fluorescencewavelength associated with a peak emission wavelength of the lightsource 65 a. Both the peak fluorescence wavelength and the pattern ofthe mark 105 can be used to determine authenticity. Upon determiningwhether the product 100 is authentic, the device 50 a can display anicon on the display 55 a to communicate a positive or negative response.

It is to be appreciated that that material formulation is notparticularly limited. For example, the material formulation can includea noble metal. In other embodiments, the noble metal can include gold orsilver. In some embodiments, the noble metal is in the form ofparticulate spheres, cylinders, ovals, cubes, rectangular prisms,triangular prisms, pyramids, cones, octahedrons, dodecahedrons, or anycombination thereof. In some embodiments, the noble metal is in the formof particulate spheres with particle diameters in the range of 0.1 nm to100 nm. In some embodiments, the noble metal is in the form of a thinfilm. In some embodiments, the thickness of the noble metal film is inthe range of 1 nm to 10 μm. In other embodiments, the materialformulation can include quantum dots. In some embodiments, the diametersof the quantum dots are in the range of 0.1 nm to 100 nm. In someembodiments, the composition of the quantum dots comprises cadmium,selenium, lead, sulfur, arsenic, phosphorus, indium, zinc, silicon,tellurium, oxygen, or any combination thereof. As another example, thematerial formulation can include an organic material organic materialcomprises a molecule, pigment, polymer, or combination thereof. In someembodiments, the organic material can include a dye. The dye is notparticularly limited and may include xanthenes, cyanines, squaraines,napthalenes, coumarins, oxadiazoles, anthracenes, pyrenes, oxazines,acridines, arylmethines, tetrapyrroles, green fluorescent proteins,FMN-binding fluorescent proteins, small ultra red fluorescent proteins,any combination or derivative of. The dye may also include commercialdies, such as CF Dyes, DRAQ, CyTRAK, BODIPY, Alexa Fluor, DyLightFLuor,Atto, Tracy, FluoProbes, Abberior Dyes, DY, MegaStokes Dyes, Sulfo CyDyes, HiLyte Fluor, Seta, SeTau, Square Dyes, Quasar, Cal Fluor dyes,Surelight Dyes, APC, APCXL, RPE, BPE, Vio Dyes, or any combination orderivative of.

In other embodiments, the material formulation can be functionalizedthrough the addition of chemical groups. The chemical groups maycomprise amines, amides, arenes, alcohols, alkanes, alkenes, alkynes,benzenes, halides, epoxides, ketones, aldehydes, acyl halides, esters,acid anhydrides, peroxides, acetals, hemiacetals, orthoesters, ethers,imines, imides, azides, cyanates, nitrates, nitriles, nitrites, nitrogroups, nitroso groups, oximes, pyridines, carboxylic acids, thiols,sulphides, disulphides, sulfoxides, sulfones, sulphinic acids, sulphonicacids, thiocyanates, thioketones, thials, phosphines, phosphonic acids,phosphates, boronic acids, boronic esters, borinic acids, borinicesters, selenols, selenoaldehydes, selenoketones, selenides,diselenides, selenoxides, selenones, seleninic acids, selenenic acids,selenyl halides, anilines, silanols, siloxides, siloxanes, silyl ethers,silyl halides, or any combination or derivative thereof. In furtherembodiments, the material formulation can also be functionalized throughinteractions with metal ions. The metal ions may comprise ions of gold,silver, magnesium, erbium, cobalt, iron, nickel, platinum, or anycombination or derivative thereof.

Additionally, the material formulation can include the organic materialsuch as carbonaceous particles. In some embodiments, the diameters ofthe carbonaceous particles are in the range of 0.1 nm to 100 nm. In someembodiments, the carbonaceous particles are functionalized through theaddition of chemical groups. The chemical groups may comprise thosediscussed above. In some embodiments, the carbonaceous particles arefunctionalized through interactions with metal ions, which may compriseions of gold, silver, magnesium, erbium, cobalt, iron, nickel, platinum,or any combination or derivative thereof. The material formulation mayalso have other characteristics such as luminescent: photoluminescence,chemiluminescence, electroluminescence, mechanoluminescence,thermoluminescence, or any combination thereof.

Additionally, exposing the mark 105 to each of the light emitting diodes210 can provide other peak fluorescence wavelengths (i.e. colors)emitted from the mark 105. The additional peak fluorescence wavelengthscan result from the different peak emission wavelengths of each of thelight emitting diodes 210. The mechanism by which the additional peakfluorescence wavelengths are provided is not particularly limited. Forexample, a material formulation can provide different responses to lightof varying wavelengths. As another example, multiple materialformulations can be used in the mark 105 where each of the lightemitting diodes 210 can excite a different material formulation whilethe remaining formulations are not responsive.

The manner by which the images captured are analyzed is not particularlylimited. In the present embodiment, each image is analyzed by thesoftware and mapped onto the red-blue-green (RGB) color space. Theanalysis can also include a feature finding algorithm to locate the mark105 on a product 100. In addition, the analysis can use binning the databased on value, advanced statistics and histograms to identify the mark105. The corresponding RGB code can be converted to hex format. The dataacquired from these images is compiled in order to generate a uniqueidentifier associated with the mark 105.

In other embodiments, the unique identifier will include multiple hexcodes. Each of the hex codes can be calculated from an image by plottingthe results as a Kronecker delta function. The pattern of linesgenerated by the plot can be used as the unique product identifier.

It is to be appreciated by a person of skill in the art with the benefitof this description that the system 200 can also be used to track andtrace the product 100 as it is distributed throughout a supply chain. Inthis regard, the authentication process can be used to delineatedifferent events in the supply chain. For example, the color emittedfrom the mark 105 when exposed to the light source 65 a can be used byconsumers to access product information. This form of authenticationdoes not require the additional light source 205, which precludes theneed for consumers to obtain additional hardware. Alternatively, asupply chain user can use the light source 205 to update productinformation by verifying the fluorescent response of the mark 105 toprovide additional security measures that would preclude a consumer fromupdating this information.

FIGS. 5a and 5b generally show system 300 for product authentication inaccordance with another embodiment. The system 300 involves the use of adevice 50 b that is connected to a scanner 305. In the presentembodiment, the device 50 b is a laptop computer. However, it is to beappreciated by those skilled in the art that other computing devicessuch as a desktop computer, tablet, or smartphone can be substituted. Inthe present embodiment, the device 50 b includes a computer readablemedium encoded with codes and/or programming instructions to facilitatean authentication process as well as verify the identity of the user. Inthis embodiment, the device 50 b requires a login procedure such as inusing an alphanumeric password before the software authorizes theauthentication. In the present embodiment, the scanner 305 includes anoptional display 310 that can be used to render output that indicatesthe status of the authentication. The product 150 is inserted into thescanner 305 to begin authentication. In the present embodiment, theproduct 150 is a document having an invisible mark in the target 155. Itis to be appreciated that the target 155 is optional and may not beincluded in other embodiments. The scanner 305 operates in a similarfashion to a solid state fluorimeter where the product 150 can beexposed to a series of excitation wavelengths. The emission profileacquired from each excitation wavelength can be compiled to generate aunique product identifier.

The scanner 305 is not particularly limited and can include any deviceconfigured to scan images of documents using different excitationwavelengths. The manner by which the excitation wavelengths aregenerated is not particularly limited and can include using differentlight sources. For example, the scanner can include a xenon arc lamp,two monochromators, and a photodetector in the present embodiment.During the authentication scan, the xenon arc lamp is activated and theemitted light is transmitted through the first monochromator, whichexposes the mark to a particular wavelength of light. The fluorescenceemission from the mark is then transmitted through the secondmonochromator and onto the photodetector, which can include a chargecoupled device (CCD) array. The position of the second monochromator isadjusted to emit wavelengths across a specific range. The measurementsmade by the photodetector as the position of the second monochromator isadjusted represent the emission profile for the corresponding excitationwavelength.

In the present embodiment, the device 50 b is further capable ofconnecting to the internet and accessing a secure online database (notshown) that contains a library of identifiers associated with authenticproducts. The device 50 b can cross reference the identifier obtainedfrom the authentication scan with the library of identifiers from theonline database to determine authenticity. In other embodiments, thesystem 300 may be used as part of an encryption scheme. For example, thecompiled emission profiles may collectively represent an encryption key.The encryption key may be used to decode information corresponding tothe product. In the context of the system 300, the encryption key can beused to decode the information contained in the product 150.

FIG. 6 is a method of authenticating a product is represented in theform of a flow-chart and indicated generally at 500. In order to assistin the explanation of the method 500, it will be assumed that the method500 is performed using the system 200. Furthermore, the followingdiscussion of the method 500 will lead to further understanding of thesystem 200 and its various components. In particular, it is to beunderstood that in one embodiment, the programming instructions of thedevice 50 a direct a processor to carry out the methods discussed below.However, it is to be understood that the system 200 and/or the method500 can be varied, and need not work exactly as discussed herein inconjunction with each other, and that such variations are within thescope of the present invention.

Block 505 involves capturing an image of the mark 105 in the absence ofthe excitation light source. In the present embodiment, the mark 105 isnot visible to the naked eye without activation by a light source.Accordingly, in this example, the image captured in the block would beblank. Therefore, it is to be appreciated by a person of skill in theart with the benefit of this description that this block may be optionalor omitted in some embodiments.

Block 510 involves activating a light source, such as one or more of thelight emitting diodes 210 and the light source 65 a. Next, block 515involves capturing an image of the mark 105 using the camera 60 a whenexposed to the excitation light.

The two images captured during the execution of blocks 505 and 510 arethen subjected to block 520, which involves the application of asaturation mask to extract the mark 105. Prior to the application of thesaturation mask, the images obtained by the execution of blocks 505 and515 can be pre-processed for the saturation mask. For example, theimages can be de-noised through the application of a Gaussian filter, amedian filter, or another filter. The filtered image can then beprocessed using image recognition algorithms to locate visible featuresin the image through feature matching or via thresholding to point tospecific regions that have been printed with a machine readable pattern.The application of the saturation mask is not particularly limited andcan include a single-channel or multi-channel mask from a color space.The data obtained after the application of the mask can then bede-convoluted via averaging over a given dimension, binning the databased on value, advanced statistics, or histogram analysis.

It is to be appreciated by a person of skill in the art that theapplication of a saturation mask can be optional and used only forimages where the mark is not readily visible. If the image captured atblock 515 clearly shows the mark 105, the application of the saturationmask may be omitted. Furthermore, a variety of color space isolationmethods can be used as a substitution, such as a hue mask or is a singlechannel or multi-channel mask using any combination of RGB, CYMK, HSV,HLS, YCrCb, CIE-XYZ, CIE-Lab or Clu-Luv colorspaces.

Furthermore, it is to be appreciated by a person of skill in the artthat the image captured at block 505 can provide an additionalverification step to detect fraudulent marks. In particular, since thereis no significant fluorescence in the absence of the excitation light,the mark 105 remains undetectable in the image from block 505. If themark 105 is notable in the image from block 505, it indicates that themark 105 is fraudulent.

Block 525 comprises making a determination of whether the mark 105 ispresent in the image from block 515. The manner by which this isaccomplished is not particularly limited and can include analyzing theresults from the execution of block 520. If the mark 105 is not present,the system 200 generates output indicating that the product is notauthentic. In an example of an authentic product, the image from block515 exhibits a substantial color change where the mark 105 is present,to enable the identification of the pixels that to be used forsubsequent processing and the method 500 continues to block 535.Alternatively, if there is no significant or continuous variation incolor across different pixels, the system 200 determines that a securitymark is not present and the method 500 proceeds to block 530 where thesystem 200 renders output of a negative result indicating that theproduct 100 is not authentic.

Block 535 involves performing colorimetric analysis on the fluorescenceresponse by analyzing the detected fluorescence spectrum from the mark105 to determine a hex code. The color of each pixel identified in block520 is converted into hex code and cross referenced the expected valueof a mark provided by the manufacturer of the product 100. In thepresent embodiment, the hex code is cross reference with a secure onlinedatabase that contains the hex codes associated with authentic products.However, in other embodiments, the database can be stored locally. Ifthere is a positive match, the method 500 proceeds to block 550 wherethe system outputs a positive result confirming authenticity.Alternatively, if the hex code does not match the expected values, themethod 500 proceeds to block 545 where the system 200 renders output ofa negative result indicating that the product 100 is not authentic

Variations are contemplated. For example, in other embodiments, thesoftware may also use the online database to match the pattern of themark to the hex code. In addition, a combination of different patternsand fluorescence spectra can be used to provide each product with aunique identifier. By matching these two characteristics, the system 200can determine what product the user is authenticating and communicateinformation relating to that specific product.

Referring to FIG. 7, another method of authentication is represented inthe form of a flow-chart and indicated generally at 600. In order toassist in the explanation of the method 600, it will be assumed that themethod 600 is performed using the system 200. Furthermore, the followingdiscussion of the method 600 will lead to further understanding of thesystem 200 and its various components. Furthermore, it is to beemphasized, that method 600 need not be performed in the exact sequenceas shown and that various blocks can be performed in parallel ratherthan in sequence; hence the elements of the method 600 are referred toherein as “blocks” rather than “steps”. In particular, it is to beappreciated that block 605 and block 610 can be switched or carried outsimultaneously.

Beginning at block 605, a user verifies their identity. The manner bywhich the verification is carried out is not particularly limited. Inthe present embodiment, the system uses a fingerprint analysis. Forexample, the device 50 a can be a smartphone are equipped with theability to detect fingerprints. If the user is a consumer, they may berequired to create an account in order to become authorized. If the userdoes not have the proper authorization, the software may prompt the userto create an account or provide personal information.

Once the user is identified, block 610 involves determining theauthenticity of the mark 105. The manner by which authenticity isdetermined is not particularly limited and can involve capturing animage of the mark 105 with and without the excitation light sourcesimilar to the method described in the method 500. If the product 100 isdetermined to be not authentic, the method 600 proceeds to block 615where the system 200 outputs an error or that the product is notauthentic.

Alternatively, if the product 100 is determined to be authentic, thesystem 200 proceeds to block 620 to determine if the user is in thesupply chain. The manner by which this determination is made is notparticularly limited. In the present embodiment, the system uses theinformation obtained at block 605 to discriminate users based on theirrole in the supply chain. If the user is a consumer, the method proceedsto block 625 where the system 200 outputs information that constitutesmarketing material. This information may include, but is not limited to,the origin, history, composition, or contents of the product.

If the user is determined to be a supply chain personnel at block 620,the method 600 proceeds to block 630 where the system 200 enables theuser to update information about the product 100 as part of a track andtrace regime. Users that pertain to this category may also have accessto the updates made by other supply chain personnel. In someembodiments, the supply chain personnel may be able to link the mark 105from a previous shipment to a new mark. This feature is useful forproducts that are processed or re-packaged at certain points along asupply chain. Accordingly, these “middleman” facilities can authenticatethe shipment upon arrival and package the final product with a new mark.Authorized personnel can then link the two marks together. This processmay be used to verify that there has been no dilution, substitution, oradulteration.

In the embodiments discussed above, the mark 105 is generally notvisible to the naked eye under ambient conditions because of the reducedlight intensity. When exposed to the concentrated burst of light, theintensity is sufficient to elicit a fluorescent response from the mark105 that can be detected by the authentication device and that may bevisible to the human eye. The mark 105 may be applied as an ink usingdigital printing techniques. In the present embodiment, the ink includesa resin and a plurality of fluorescent nanoparticles. In someembodiments, the ink can further include pigments, surfactants,solvents, polymers, and fillers. The mark 105 can be printed on theproduct directly or on the product packaging. The material formulationthat generates the fluorescent response may comprise a mixture ofnanoparticles. It is to be appreciated by a person of skill in the artwith the benefit of this description that the use of nanoparticlesprovides a material formulation that can be engineered accurately toachieve a desired fluorescence response to light. By changingfundamental physical and chemical properties of the nanoparticles, suchas the size, surface chemistry, and material composition the fluorescentresponse may be coupled efficiently to the output spectrum from theexcitation light source. In addition, nanoparticles are typically moreresistant to photobleaching and provide longer durability overconventional alternatives.

Furthermore, the nanoparticle formulation can also exhibit a fluorescentresponse that changes in response to different stimuli. In someembodiments, a single type of nanoparticle may be used, which exhibits afluorescent response that changes when exposed to different excitationlight sources. In other embodiments, the fluorescent response changeswhen the mark is exposed to chemical reagents. These reagents mayinclude, but are not limited to, water, ethanol, acetone,dimethylformamide, acetic acid, sodium bicarbonate, sodium hydroxide,sodium borohydride, hydrogen peroxide, potassium permanganate, or sodiumpersulfate. In the present embodiment, these reagents may be applied byspraying as a liquid solution onto the mark in order to provide a secondpoint of authentication wherein the first point of authenticationoccurred in the absence of the reagent. In other embodiments, thereagents can be applied using other means such as stamping or dispendingfrom a pen.

Referring to FIG. 8, another method of authentication is represented inthe form of a flow-chart and indicated generally at 700. Beginning atblock 705, nanoparticles are generated. The manner by which thenanoparticles are obtained is not particularly limited. For example, inthe present embodiment, the nanoparticles are generated in a reactionchamber.

At block 710, the nanoparticles are isolated in accordance with acharacteristic. In particular, the nanoparticles are isolated andclassified in accordance with their peak fluorescence wavelengthassociates with a peak emission wavelength of the light source. In thepresent embodiment, the reactions generating the nanoparticles canprovide multiple types of nanoparticles which can then be isolated suchthat nanoparticles having a desired peak fluorescence wavelengthresponse to a peak emission wavelength is obtained.

Next, block 715 involves embedding nanoparticles isolated at block 710into a resin to form an ink for printing. The manner by which thenanoparticles are embedded is not particularly limited. In the presentembodiment, the nanoparticles are simply mixed with the resin. The resinis also not particularly limited and can be varied depending on theintended application, such as surface, to which the ink would beprinted. In other embodiments, the nanoparticles can be encapsulated bya polymer such as polyester, polystyrene, polyethylene, polyurethane,polypropylene, polyvinyl chloride, polytetrafluoroethylene, polyamide,polyethylene terephthalate, or any combination or derivative thereof.

After the nanoparticles are embedded in the resin, the resin is appliedto the product 100 at block 720. The manner by which the resin isapplied is not particularly limited and can in various printingtechniques. For example, the resin can be applied using flexographic,offset, gravure, or digital printing. Accordingly, the applied resinbecome the mark 105 on the product.

Various advantages will now be apparent to a person of skill in the art.Of note is that the embodiments described above are useful forapplications where counterfeiters are known to be highly skilled. Underthese conditions, the counterfeiter may have sufficient resources toduplicate a mark on a package. However, it is very unlikely a hackerwill be able to duplicate the fluorescent response based on a specificemission spectrum. In other embodiments, the user may gain access toproduct information if the product 100 is deemed authentic. Theinformation communicated to the user can also be customized depending onthe user's identity to provide further streamlined use. Furthermore, byusing a mark that simply requires a simple device such as a smartphone,additional hardware would not need to be purchased to implement thisauthentication method.

While specific embodiments have been described and illustrated, suchembodiments should be considered illustrative only and should not serveto limit any future claims, such as the exemplary claims providedherein.

What may be claimed is:
 1. A method of product authentication, the method comprising the steps of: generating an authentication mark on a product, wherein the authentication mark comprises a visible target mark and a pattern formed by a plurality of fluorescent nanoparticles having a peak fluorescence wavelength; providing a light source having a peak emission wavelength associated with the peak fluorescence wavelength; capturing at least one image of the authentication mark while activating the light source; locating the visible target mark in a specific region and extracting the pattern; and authenticating the product by using the pattern.
 2. The method of claim 1, further comprising: illuminating the authentication mark on the product using the light source; and measuring a fluorescent response to the light source.
 3. The method of claim 2, further comprising performing colorimetric analysis on the fluorescent response.
 4. The method of claim 1, wherein the light source comprises a plurality of light emitting diodes, and each light emitting diode of the plurality of light emitting diodes emits light having a different peak emission wavelength.
 5. A system for product authentication, the system comprising: an imaging device capturing images of an authentication mark applied to a product; a light source device attached to the imaging device, the light source device comprising at least one light source each having a peak emission wavelength; the authentication mark comprises a visible target mark and a pattern formed by fluorescent nanoparticles having a peak fluorescence wavelength associated with one of the peak emission wavelengths; a resin into which the fluorescent nanoparticles are embedded, the resin for applying on the product; the imaging device capturing images of the authentication mark with the at least one light source being activated; locating the visible target mark in a specific region and extracting the pattern to authenticate the product.
 6. The method of claim 1, wherein generating the authentication mark comprises the steps of: generating a plurality of nanoparticles in a reaction chamber; isolating fluorescent nanoparticles from the plurality of nanoparticles; embedding the fluorescent nanoparticles in a resin; and applying the resin proximate to the target mark on the product.
 7. The method of claim 6, wherein the resin is clear to form a clear coat on the product.
 8. The method of claim 6, wherein applying the resin comprises applying the resin in the pattern.
 9. The method of claim 8, wherein the pattern is a machine readable code.
 10. The method of claim 6, further comprising adding pigment to the resin to form an ink.
 11. The system of claim 5, further comprising a processor configured to perform colorimetric analysis on the images.
 12. The system of claim 5, wherein the light source is a light emitting diode.
 13. The system of claim 5, wherein the light source comprises a plurality of light emitting diodes.
 14. The system of claim 13, wherein each light emitting diode of the plurality of light emitting diodes emits light having a different peak emission wavelength.
 15. The system of claim 5, further comprising an ink formed from the resin and the fluorescent nanoparticles.
 16. The system of claim 5, wherein the resin is clear to form a clear coat on the product.
 17. The system of claim 5, wherein the resin is applied on the product in a pattern.
 18. The system of claim 17, wherein the pattern is a machine readable code.
 19. A non-transitory computer readable medium encoded with codes, the codes for directing a processor to: receive an image data from a detector configured to detect a visible target mark; activate a light source having a peak emission wavelength; receive the image data from the detector configure to detect a fluorescence response to the light source by fluorescent nanoparticles, wherein the fluorescence response has a peak fluorescence wavelength associated with the peak emission wavelength; apply a saturation mask to the image data; locate the visible target mark in the image data; extracting an authentication pattern; and perform colorimetric analysis to determine the peak fluorescence wavelength in the authentication pattern to authenticate a product.
 20. The non-transitory computer readable medium of claim 19, wherein the light source is a light emitting diode. 